Ventilating-sash fastener



Nov. l2, 1929. R. KRASBERG VENTILATING SASH FASTENER Original Filed June27, 1927 all IZ//Am on the line 2 2 of Figure 1.

Patented Nov.r 12, 1929 UNITED ASTATES RUDOLF KRASBERG, OF CHICAGO,ILLINOIS VENTILATING-SASH FASTENER Application led J'une 27, 1927,Serial No. 201,670. Renewed April 3, 1929.

This invention has for its object to provide a simple, cheap andeiiicient sash-fastener of the type which permits of a partial lopeningof the window for ventilation purposes, a fur- 5 ther object of theinvention being to provide a device of this character which operatesautomatically to limit the relative opening 'movement of window sashesand requires manual manipulation to permit full opening of the same.

A further object of the invention is to provide a device of thecharacter set forth the parts of which become interengaged as soon asone of the sashes is moved a distance substantially equal to thatrequired to cause the lower edge of the lowerrail of the lower sash tobecome flush with the top surface of the inner sill of the window.

Other objects of the invention will be readily understood from thefollowing description.

The preferred embodiment of the invention is illustrated in theaccompanying drawings `wherein Figure 1 is a fragmentary view inelevation of a portion of a conventional slide-sash window7 latehingfrom within the building, equipped with a sash-fastener constructed inaccordance with the invention.

Figure 2 is a fragmentary vertical section Figure 3 is a fragmentaryplan section on the line 3-3 of Figure 2. f

Figure 4 is a detail vertical section on the line 4-4 of Figure 2.

The device comprises a bell crank lever 1 pivotally mounted at its elbowportion between t-he flanges 2 of the plate 3 which is mounted upon thetop face of the upper rail a of the lower sash 5. One end portion of thelever 1 is of greater length and weight than the other end portionthereof and terminates in a projection 6 which normally (by gravity)projects over the upper face of the lower rail 7 of the upper sash 8,said lever being sufliciently loosely pivotally mounted to permit it toswing freely.

Pivotally secured at its upper end to the inner face of a side rail ofthe upper sash is a sheet metal plate 9, the respective end portions ofwhich extend angularly of each other, said plate being of such lengthand its pivotal connection with the side rail of the upper sash sodisposed that the lower end of said plate normally rests upon the upperface of the lower rail 7 and, when so disposedthe lower end portion 1()of said plate 9 is verticallydisposed. A continuous longitudinal slot 11in said plate 9 follows the contour thereof in parallelism with the sideedges thereof, said slot terminating short of the terminals of saidplate.

The position of the bell-crank lever 1 on the upper rail of the lowersash is such, with respect to the lower end portion of said plate 9,that the end portion of said lever carrying the projection 6 projectsthrough the vertically disposed end portion of the slot 11 of the plate9 when the sashes are in closed or substantially closed position andsaid plate 9 is in its ynormal position. The pivotal as-- sociation ofsaid plate 9 with the side rail of the upper sash must necessarily bealso sufliciently loose to permit said plate 9 to be maintained bygravity in its normal position.

The several above-described elements being in relatively normalpositions, it will be seen that upon raising the lower sash or loweringthe upper sash a distance substantially equal to the depth of theshoulder provided by the outer edge of the inner portion of the windowsill, the projection 6 of the lever 1 will become disposed just abovethe vertical portion of the slot 11 and in engaging relation to theangularly disposed upper end portion of the plate 9 and thus the saidlever 1 may not be moved out of such engaging relation without returningthe sashes to approximately their relative v closed positions. Furtherrelative A opening movement of said sashes will cause the lever 9 tocontact with an inner side wall of the slot 11 and thus turn the plate 9on its pivot until it becomes substantially inverted and the lever 9engages the normally lower end wall of the slot 11 as shown in dottedlines in Figure l.

If, however, prior to effecting relative opening movement of the sashes,the lever l is moved to the position shown in dotted lines in Figure 2,and is held in this position until the projection 6 is disposed abovethe vertical portion of the slot 11, the sashes may be moved to fullopen position, the lever 1 being released after passing the point lastabovementioned. Upon restoring the sashes to closed position the lever 1will be turned on its pivot to position to slide over the inner face ofthe portion of the plate 9 disposed in its path by said portion and willthen return to the normal position shown in Figure 2. Consequently,unless the lever 1 is intentionally operated to permit full opening ofthe window the latter ,can be opened only to the limited extentindicated. Obviously this limited opening is intended to permitventilat-ion and safeguard `against burglary.

For low cost and ease of manufacture, the plate 3 consists of two equalportions each of which is provided with a flange 2, the latter beingsecured against separation and their relative pivotal movement resistedby means of the rivet 12 having a middle portion 13 of greater diameterthan the end portions thereof, said portion 13 being of somewhat greaterlength than the thickness of the lever 1 of which it constitutes thepivot, the said portion `13 thus functioning as pivot and spacingelement.

Preferably the side portions of the plate 3 are so formed that theypresent straight edge portions 14 inwardly of their extreme inner andouter edge portions, lthe latte-r being preferably disposed to overlapthe upper face of 'the lower rail ofthe upper sash in order to preventmanipulationof the lever 1 by inserting a knife blade or the likethrough the space between the opposing faces of the meeting rails of thesashes from .the exterior of the building'and, to this end, the twoparts of the plate 3 adjacent the flanges 2 are provided with contactingmeeting edges to prevent manipulation of the lever 1 by insertion of awire in place of the knife blade or the like. The edge portions 14opposing the upper sash constitute gauges to guide the person securingthe plate 3 in properly positioning the latter on the lower sash withrespect to the inner or meeting edge of its upper or meeting rail.

I claim as my invention:

1. A device of the kind specified comprising a longitudinally slottedmember having a bend between its lends pivotally secured at its upperend to a side rail of the upper sash of a window, for normallypositioning by gravity with the lower end portion of the slot thereinvertically disposed, a lever loosely pivot-ally mounted upon lthe lowersash for normal positioning with one end thereof projecting through saidvertical portion of said slot when the sashes are in Closed position,and a projection at the inner end of said lever adapted to engage aportion of said member as said lever moves toward the end of saidportionof said slot during initial relative opening movement of the windowsashes.

2. A device of the kind specilied comprising a member pivotally securedto a side rail of the upper sash of a window and provided with acontinuous longitudinal slot, one part of which extends angularly of theother part thereof, one of said parts being vertically disposed whensaid member is in normal position and the other then extending at anupward incline, a lever pivotally mounted on the lower sash and havingone end portion normally projecting through the vertically disposedportion of said slot when the sashes are in substantially closedposition, said end portion of said lever provided with a projectionadapted to engage a portion of said member bordering the upwardlyinclined portion of said slot as the sashes are moved to partially openposition to thereby prevent disengagement of said lever with saidmember.

3. A device of the kind specified comprising a member pivotally securedto a side rail of the upper sash of a window and provided with acontinuous longitudinal slot, one part of which extends angularly oft-he other part thereof, one of said parts being verticallv disposedwhen said member is in normal position and the other then extending atan upward incline, a lever pivot-ally mounted on the lower sash andhaving one end portion normally projecting through the verticallydisposedportion of said slot when the sashes are in substantially closedposition, said `end portion of said lever provided with a projectionadapted to engage a portion of said member `bordering the upwardlyinclined portion of said slot as the sashes are moved to partially openposition to thereby prevent disengagement of said lever with saidmember, the latter and said lever arranged to maintain theirinterengagement with each other during closure thereof to thereby eifectself-restoring of said member to normal position during such closure.

4. A device of the kind specified ycomprising a member pivotally securedto a side rail of the upper sash of a window and provided with acontinuous longitudinal slot, one part of which extends angularly of theother part thereof, one of said parts being vertically disposed whensaid member is in normal position and the other then extending at anupward incline, a device mounted on the lower sash and having one endportion normally projecting through the vertically disposed portion ofsaid slot when the sashes are in substantially closed position, said endportion of said device provided with a projection adapted to engage aportion of said member bordering the upwardly inclined portion of saidslot as the sashes are moved to partially open position to therebyprevent disengagement of said device with said member, said device beingmanually operable to maintain the same out of engaging relation to saidmember to permit full relative opening movement of the sashes.

5. A device of the kind specified comprising a member pivotally securedto a side rail of the upper sash of a window and provided with acontinuous longitudinal slot, one part of which extends angularly of theother part thereof, one of said parts being vertically disposed whensaid member is in normal position and the other then extending at anupward incline, a manually shiftable device mounted on the lower sashand having one end portion normally projecting through the verticallydisposed portion of said slot when the sashes are in substantiallyclosed position, said end portion of said device provided with aprojection adapted to engage a portion of said member bordering theupwardly rail.

RUDOLF KRASBERG.

inclined portion of said slot as the sashes are moved to partially openposition to thereby prevent disengagement of said device with saidmember, said device being manually operable to maintain the same out ofengaging relation to said member to permit full relative openingmovement of the sashes, said member and said device remaininginterengaged during closing movement of said sashes to thereby restoresaid member to its normal position.

6. A device of the kind specified including a bell crank lever, and apivotal support therefor comprising a pair of equal plates havingopposed meeting edges, a flange spaced from the meeting edge of eachplate to provide space between said flanges for the reception of saidlever, and a pivot member for the latter secured at its ends to therespective flanges for coupling said plates.

7 A device of the kind specified including a bell crank lever, and apivotal support4 therefor' comprising a pair of equal plates havingopposed meeting edges, a flange spaced from the meeting edge of eachplate to provide space between said flanges for the reception of saidlever, and a pivot member having a middle portion of greater diameterthan its end portions and constituting a spacing member for determiningthe spacing of said flanges from each other independently of saidmeeting edges, the end portions of said pivot member secured to saidflanges and said middle portion thereof constituting the pivot for saidlever.

8. A device of the kind specified including a bell crank lever, and apivotal support therefor comprising a pair of equal plates havingopposed meeting edges, a flange spaced from the meeting edge of eachplate to provide space between said flanges for the reception of saidlever, and a pivot member having a middle portion of greater diameterthan its end portions and constituting a spacing member for determiningthe spacing of

